(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "The Morphology And Evolution Of The Apes And Man"

DIGESTION  AND  ABSORPTION             2i;>
The lltuw aii'3 jejunum are 11 ft. 5 :n. long. Their villi are small. At intervals there are groups of filial] longitudinal folds of the mucosa. Four Fever's j:atche-are present at wide intervals in the lower half of the ileum ; the lowest, which is also the largest, :s '2 in.
>m
long and 4s in. broad.
The rermiform ajtpoulix is 4i in. long, and the en?-.0*1 is 3 in. No appendix valve is present, but the ileo-cjs-eai orifice is guarded bv a shelf valve,
tJ                             U
The colon is 4 ft. lon^r.    It- is sacculated as usual bv
o                                                          •
two longitudinal muscle bands, and there are :Łany appendices epiploicse. Xo Fever's patches are present. The most capacious part is the sigmoid colon.
The rectum and anal canal are 54 in. long. In the rectum there are eight circular folds, of which the fifth is very prominent, and below it there is a deep pocket on the left side. The anal canal shows numerous strongly-developed vertical folds of rnucosa, representing the columns of Morgagni, but there are no traces of the valves of Ball. The entire rectum and anal canal form a straight tube without any trace of the flexures present in Man, Herrmann ($4) has described the anal mucosa in detail, and Sperino (401) showed that the sebaceous follicles in the skin round the anus are large. In the Gorilla the duodenum is divided into three parts as in Man, but the first part is short. Valvulae conni-ventes are present in the adult, but are absent in the early foetus; and Deniker (44) pointed out that they appear later in development in the Gorilla than in Man. The ileum and jejunum show nothing peculiar. Five or six Feyer's patches were observed by Deniker in the foetus. The caecum is provided with a well-marked